Liquid crystal display device having nut member fixed on housing

ABSTRACT

A liquid crystal display device includes a liquid crystal display element, a frame member having a frame-shaped part which is arranged at a displaying surface side of the liquid crystal display element and having a display window exposing a displaying surface of the liquid crystal display element, and a side wall which is extended from the frame-shaped part along a thickness direction of the liquid crystal display element. A light source is arranged opposite to another surface of the liquid crystal display element which is opposite to the displaying surface thereof and irradiates the another surface of the liquid crystal display element with illumination light. A housing member which houses the light source has a main surface opposite to a frame-shaped part of the frame member and a side wall formed at a periphery of the main surface thereof.

CROSS REFERENCE TO RELATED APPLICATION

This is a divisional of U.S. application Ser. No. 09/797,598, filed Mar.5, 2001 now U.S. Pat. No. 6,741,299, the subject matter of which isincorporated by reference herein and is related to another divisional ofU.S. application Ser. No. 09/797,598 which is filed on even dateherewith.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relate to a liquid crystal display device used fora personal computer, a work station, or the like, and particularly to atechnique effective in reduction in picture frame width of a liquidcrystal display device, and in reduction in thickness thereof.

2. Description of the Related Art

An STN (Super Twisted Nematic) system or a TFT (Thin Film Transistor)liquid crystal display module is widely used as a display device of anotebook-size personal computer or the like.

The liquid crystal display module is constituted by a liquid crystaldisplay panel in which a driving circuit portion is arranged at itsperiphery and a backlight unit for illuminating the liquid crystaldisplay panel.

The backlight unit is constituted by, for example, a light guide bodyfor guiding light radiated from a light source to a portion distant fromthe light source and for uniformly irradiating the whole liquid crystaldisplay panel with the light, a cold-cathode fluorescent lamp as alinear light source arranged in the vicinity of the light guide body,along a side of the light guide body, and in parallel with the side, adiffusion sheet arranged on the light guide body, a lens sheet (alsocalled a prism sheet) arranged on the diffusion sheet, and a reflectionsheet arranged to extend to a lower side of the light guide body, whichare housed in a mold.

Incidentally, the technique like this is disclosed in, for example,Japanese Patent Publication No. 19474/1985, Japanese Utility ModelUnexamined Publication No. 22780/1992, and U.S. Pat. No. 5,835,139.

SUMMARY OF THE INVENTION

FIG. 22 is a schematic view for explaining an example of a fittingmethod for fitting a liquid crystal display module to a notebook-sizepersonal computer.

In the drawing, reference numeral 100 designates an outer case of adisplay portion of a notebook-size personal computer; and 101, an innercase of the display portion of the notebook-size personal computer. Asshown in the drawing, a liquid crystal display module 102 is fixed tothe outer ease 100 of the notebook-size personal computer by fittingscrews 120 through a side beam 110.

Thus, inserts to which the fitting screws 120 are screwed, are embeddedin the mold of the liquid crystal display module 102.

Incidentally, although the side beam 110 and the fitting screws 120 areprovided at both sides of the liquid crystal display module 102, theyare omitted in FIG. 22.

However, in recent years, as a picture frame width of the liquid crystaldisplay module is reduced and the thickness thereof is reduced, thethickness of the mold itself is further reduced to, for example, 5.0 mmor less. “The picture frame” of the liquid crystal display moduledescribed in this present specification designates, for example, aframe-like portion surrounding an opening both of which are provided inan upper surface of the liquid crystal display module 102 shown in FIG.22.

Thus, in a conventional liquid crystal display module, there has been aproblem that it is difficult to certainly fit the insert in the mold.

Besides, there is also known a method in which a compromise plate nut isused, and the fitting screw 120 is screwed to this compromise plate nut,so that the liquid crystal display module is fitted to the notebook-sizepersonal computer.

In this case, the fitting screw 120 is prevented from being dropped offfrom the frame by inserting the compromise plate nut into a notch of themold (the inner case) and pressing it with a side of the frame (an outercase) which is fitted in this so as to cover the outer periphery of themold.

However, there has been a problem that it is difficult to simultaneouslyfit four or more compromise plate nuts in the notches of the mold and tocover them with the frame.

The present invention has been made to solve the problems of the priorart, and an object of the present invention is to provide a technique ina liquid crystal display device which enables a screw member to which afitting screw for fixing a liquid crystal display device to an exteriorease is screwed, to be easily and certainly fitted.

Another object of the present invention is to provide a technique in aliquid crystal display device which enables a screw mechanism of afitting screw for fixing a liquid crystal display device to an exteriorease to be simplified.

Still another object of the present invention is to provide a techniquewhich enables the picture frame width of a liquid crystal display deviceto be reduced.

Still another object of the present invention is to provide a techniquewhich enables the thickness of a liquid crystal display device to bereduced.

The objects, other objects and novel features of the present inventionwill be clarified by the description of the present specification andthe accompanying drawings.

Among the inventions disclosed in the present application, the briefdescriptions of the typical ones are as follows:

That is, the present invention is applied to a liquid crystal displaydevice in which a frame member (casing-like member) is fixed in ahousing member (typified by a member known as a mold) for housingcomponents (liquid crystal display panel, light source, optical sheet,etc.) of the liquid crystal display device to constitute a so-calledliquid crystal display module, and this liquid crystal display module isfixed to an exterior case.

The housing member includes, for example, a main surface and sidesurfaces formed around its periphery, and optical parts as thecomponents of the liquid crystal display device are housed on the mainsurface surrounded by the side surfaces.

In the case of the liquid crystal display module provided with asidelight type light source, a reflection plate, a light guide body, anoptical sheet such as a light diffusion sheet and a prism sheet arestacked up in this order on the main surface. The light guide body isarranged in the inside of the housing member so that one of its mainsurfaces faces the main surface of the housing member, and a lightsource unit including a fluorescent lamp is provided along at least oneof its side surfaces.

In the case of the liquid crystal display module provided with a directbacklight type light source, a reflection plate, a light source unitmade of a plurality of fluorescent lamps fixed to this, a lightdiffusion plate, an optical sheet, and a liquid crystal display panelare stacked up in this order on the main surface.

Either of the light sources is arranged to face a main surface of theliquid crystal display panel opposite to a display surface side (mainsurface side of a frame member), and irradiates light (illuminatinglight) radiated from this light source to the main surface of the liquidcrystal display panel. Incidentally, this stacking direction of theparts is called a thickness direction of the liquid crystal displaydevice or the liquid crystal display module in the presentspecification.

The liquid crystal display panel is also called a liquid crystal displayelement, and is distinguished from the liquid crystal display deviceincluding this and its peripheral part. The exterior case is a box inwhich the liquid crystal display module (also called the liquid crystaldisplay device) including the housing member and the frame member ishoused, and corresponds to, for example, a housing of a notebook-sizepersonal computer. Thus, for example, the outer surface of the liquidcrystal display module is covered with the exterior case (also calledthe outer ease) except for its display surface (a screen on which animage is displayed).

When the present invention is applied to this sort of liquid crystaldisplay device, a screw tightening member (hereinafter referred to as a“screw member”) to which a fitting screw for fixing the liquid crystaldisplay module to the exterior case is screwed, is provided at the sidesurface (side wall) of the housing member, a protruded portionprotruding in the thickness direction of the liquid crystal displaymodule (in other words, in the height direction of the side wall of thehousing member) is provided in a region where the screw member of thehousing member is provided, and further, an opening in which theprotruded member of the housing member is inserted, is provided in theframe member. In the case of the fitting screw having external thread(i.e. being a bolt), the screw member has internal thread formed thereat(as being i.e. Nut).

The aforementioned means is able to sufficiently increase the thickness(in the thickness direction of the liquid crystal display module) of theperiphery of the screw member of the housing member.

For example, even if the thickness (in the thickness direction of theliquid crystal display module) of the housing member is made 5.0 mm orless by the reduction in thickness of the liquid crystal display device,the present invention is still able to prevent the screw member fromrotating in the housing member or being drawn out therefrom.

Besides, the present invention is characterized in that in a liquidcrystal display device, a screw member to which a fitting screw forfixing the liquid crystal display device to an exterior case is screwed,is provided at a side wall of a housing member, a protruded portionprotruding in a direction of a tapped hole of the screw member isprovided in a region of the side wall of the housing member where thescrew member is provided, and further, an opening in which the protrudedportion of the housing member is inserted, is provided in a side wall ofa frame member.

The aforementioned means is able to reduce the picture frame width ofthe liquid crystal display module by the thickness of the frame member.

Besides, the present invention is characterized in that in a liquidcrystal display device, a screw member to which a fitting screw forfixing the liquid crystal display device to an exterior ease is screwed,is provided at a side wall of a housing member, and a sectional shape ofthe screw member is made such that a length in a direction orthogonal tothe thickness direction of the liquid crystal display device is longerthan a length in the thickness direction of the liquid crystal displaydevice.

Since the sectional shape of the screw member is made, for example,elliptical or rectangular, the aforementioned means enables to preventthe screw member from rotating in the frame member or being drawn outtherefrom.

Besides, the present invention is characterized in that in a liquidcrystal display device, a screw member to which a fitting screw forfixing the liquid crystal display device to an exterior case is screwed,is fixed to a side wall of a housing member by adhesion or mechanicalmeans.

Since the screw member is previously fixed to the side wall of thehousing member, the aforementioned means facilitates fitting of thescrew member to the housing member, and enables to prevent the screwmember from being dropped off from the frame member in an assemblingprocess of the liquid crystal display device.

Besides, the present invention is characterized in that in a liquidcrystal display device, a screw member to which a fitting screw forfixing the liquid crystal display device to an exterior case is screwed,is inserted in a groove provided in a side wall of a housing member, andan opening of the groove is covered with a frame member.

Since the screw member is held by the groove provided in the housingmember, the aforementioned means facilitates fitting of the screw memberto the housing member, and enables to prevent the screw member frombeing dropped off from the frame member in an assembling process of theliquid crystal display device.

Besides, the present invention is characterized in that in a liquidcrystal display device, a screw member to which a fitting screw forfixing the liquid crystal display device to an exterior ease is screwed,is provided in a concave portion provided in a side wall of a housingmember, and is held by a side wall of a frame member and a pawl providedon the side wall of the frame member.

Since the screw member is held by the concave portion provided in thehousing member, the side wall of the frame member, and the pawl providedon the side wall of the frame member, the aforementioned meansfacilitates fitting of the screw member to the housing member, andenables to prevent the screw member from being dropped off from theframe member in an assembling process of the liquid crystal displaydevice.

Besides, the present invention is characterized in that in a liquidcrystal display device, a fitting screw for fixing the liquid crystaldisplay device to an exterior case is screwed to a tapped hole providedin a side wall of a frame member.

The aforementioned means enables to simplify a screw mechanism of thefitting screw.

Besides, the present invention is characterized in that in a liquidcrystal display device, a fitting screw for fixing the liquid crystaldisplay device to an exterior case, is screwed to a screw member with aspring provided on a frame member.

The aforementioned means facilitates fitting of the screw member to theframe member, and enables to prevent the screw member from being droppedoff from the frame member in an assembling process of the liquid crystaldisplay device.

In the case where the liquid crystal display device of the presentinvention described above is mounted on the housing of a computer, itbecomes unnecessary to provide a tapped hole which receives a screw (theaforementioned fitting screw) for fixing the liquid crystal displaydevice to the housing, to the housing member itself. Thus, when theliquid crystal display device (this is already assembled) is mounted onthe computer, a mechanical load (vibration, etc.) by rotation of thefitting screw is not directly applied to the housing member.Accordingly, the deformation of the housing member in an assemblingprocess of the computer, and the possibility of the resultant deviationof the liquid crystal display element, the optical sheet, and the likein the liquid crystal display device from the predetermined arrangementcan be suppressed. Especially, in the case where the housing member ismanufactured as a mold made of a synthetic resin, the effect ofpreventing the damage of the liquid crystal display device according tothe present invention becomes remarkable.

On the other hand, as the liquid crystal display device becomes thinner,the size of the housing member in the thickness direction of the liquidcrystal display device also becomes small. Under such circumstances, itbecomes difficult to provide the tapped hole to which the fitting screwis screwed, in the side wall of the housing member. If the diameter ofthe tapped hole is made larger than a predetermined ratio (depending onthe material of the housing member) with respect to the height of theside wall of the housing member, the mechanical strength of the tappedhole itself is lowered. Especially, since the screw for fitting theliquid crystal display device to the computer is required to be strongerthan the screw used for assembling the liquid crystal display device,its diameter must be made large. On the other hand, in the Liquidcrystal display device of the present invention, since the tapped holeis not directly formed in the housing member, but is formed in the screwmember prepared differently from this or in the side surface of theframe member (especially made of metal), even if the housing memberbecomes thin, the fixing strength between the liquid crystal displaydevice and the exterior case (housing of the computer, etc.) does notdeteriorate. Besides, by providing an opening without screw thread inthe side wall of the housing member and by merely inserting the tip ofthe fitting screw into this, the position of the liquid crystal displaydevice with respect to the exterior ease can be further stably held.

Besides, the present invention is characterized in that in a liquidcrystal display device in which a driving circuit board is arrangedbetween a liquid crystal display element and a housing member, a concaveportion is provided in a region of the driving circuit substrate where afitting screw for fixing the liquid crystal display device to anexterior case is provided.

Besides, the present invention is characterized in that in a liquidcrystal display device in which a driving circuit board is arrangedbetween a liquid crystal display element and a housing member, a regionof the driving circuit board where a fitting screw for fixing the liquidcrystal display device to an exterior case is provided, is constitutedby a flexible wiring board.

According to the aforementioned means, in the case where the drivingcircuit board is arranged between the liquid crystal display element andthe housing member and the thickness of the liquid crystal displaymodule is reduced, interference between the fitting screw and thedriving circuit board can be prevented.

These and other objects, features and advantages of the presentinvention will become more apparent from the following description whentaken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view showing a schematic structure ofa TFT system liquid crystal display module (LCM) to which the presentinvention is applied;

FIG. 2 is a sectional view showing a main portion sectional structure ofa backlight unit of the liquid crystal display module shown in FIG. 1;

FIG. 3 is a main portion sectional view showing a state where the liquidcrystal display module shown in FIG. 1 is fitted to a notebook-sizepersonal computer by a conventional fitting method 1;

FIG. 4 is a view for explaining a fitting portion of an insert of aliquid crystal display module of embodiment 1 of the present invention;

FIGS. 5A to 5C are views for explaining a fitting portion of an insertof a liquid crystal display module of embodiment 2 of the presentinvention, FIG. 5A is a front view of the liquid crystal display module,FIG. 5B is a main portion sectional view showing a sectional structurealong line A–A′ shown in FIG. 5A, and FIG. 5C is an upper plan viewshowing a shape of a mold to which the insert is fitted;

FIGS. 6A and 6B are views for explaining a fitting portion of an insertof a liquid crystal display module of embodiment 3 of the presentinvention, FIG. 6A is a front view of the liquid crystal display module,and FIG. 6B is a main portion sectional view showing a sectionalstructure along line A–A′ shown in FIG. 6A;

FIG. 7 is a view for explaining a method of fitting the liquid crystaldisplay module shown in FIG. 1 to a notebook-size personal computer by aconventional fitting method 2;

FIG. 8 is a view for explaining a fitting method of a plate nut of aliquid crystal display module of embodiment 4 of the present invention;

FIG. 9 is a view for explaining a fitting method of a plate nut of aliquid crystal display module of embodiment S of the present invention;

FIG. 10 is a view for explaining a fitting method of a compromise ridgednut of a liquid crystal display module of embodiment 6 of the presentinvention;

FIG. 11 is a view for explaining a fitting method of a compromise ridgednut of a liquid crystal display module of embodiment 7 of the presentinvention;

FIG. 12 is a view for explaining another fitting method of thecompromise ridged nut of the liquid crystal display module of theembodiment 7 of the present invention;

FIG. 13 is a view for explaining a fitting method of a compromise ridgednut of a liquid crystal display module of embodiment 8 of the presentinvention;

FIG. 14 is a view for explaining a fitting method of a compromise ridgednut of a liquid crystal display module of embodiment 9 of the presentinvention;

FIG. 15 is a view for explaining a fitting method of a compromise ridgednut of a liquid crystal display module of embodiment 10 of the presentinvention;

FIGS. 16A to 16C are views for explaining a fitting method of a C-shapednut of a liquid crystal display module of embodiment 11 of the presentinvention, FIG. 16A is a front view of the liquid crystal displaymodule, FIG. 16B is a main portion sectional view showing a sectionalstructure along line A–A′ shown in FIG. 16A, and FIG. 16C is aperspective view showing a shape of a metal plate 40 formed in theC-shaped nut;

FIGS. 17A and 17B are views for explaining a frame of a liquid crystaldisplay module of embodiment 12 of the present invention, FIG. 17A is afront view of the liquid crystal display module (frame), and FIG. 17B isa main portion sectional view showing a sectional structure along lineA–A′ shown in FIG. 17A;

FIGS. 18A and 18B are views for explaining a fitting method of a leafspring nut of a liquid crystal display module of embodiment 13 of thepresent invention;

FIG. 19 is a sectional view showing a main portion sectional structureof a liquid crystal display module which is reduced in thickness;

FIG. 20 is a plan view conceptually showing a plane shape of a drivingcircuit board of a liquid crystal display module of embodiment 14 of thepresent invention in a thickness direction of the liquid crystal displaymodule;

FIGS. 21A and 21B are views for explaining a shape of a driving circuitboard of a liquid crystal display module of embodiment 15 of the presentinvention, FIG. 21A is a plan view showing the arrangement of a fittingscrew, a frame, and a driving circuit board, and FIG. 21B is a mainportion sectional view showing the arrangement of the fitting screw, theframe, and the driving circuit board; and

FIG. 22 is a schematic view for explaining an example of a fittingmethod of fitting a liquid crystal display module to a notebook-sizepersonal computer.

DETAILED DESCRIPTION

Hereinafter, embodiments of the present invention will be described indetail with reference to the drawings.

Incidentally, in all drawings for the description of the embodiments,portions having the same function are designated by the same referencecharacters and the duplicate explanation is omitted.

[Embodiment 1]

<Basic Structure of a TFT System Liquid Crystal Display Module to Whichthe Present Invention is Applied>

FIG. 1 is an exploded perspective view showing a schematic structure ofa TFT system liquid crystal display module (LCM) to which the presentinvention is applied.

The liquid crystal display module (LCM) shown in FIG. 1 is constitutedby a easing-shaped frame 4 made of a metal plate, a liquid crystaldisplay panel (LCD: liquid crystal display element according to thepresent invention) 5, and a backlight unit.

The liquid crystal display panel S is constructed such that a TFT boardon which a pixel electrode, a thin film transistor and the like areformed, and a filter board on which a counter electrode, a color filter,and the like are formed, are superposed on each other with apredetermined interval, both the boards are bonded to each other by aseal member provided into a frame shape in the vicinity of the peripherybetween both the boards, a liquid crystal is injected into the inside ofthe seal member between both the boards from a liquid crystal injectionport provided in a part of the seal member, sealing is made, andfurther, polarizing plates are bonded to the outside of both the boards.

Here, a plurality of drain drivers and gate drivers made of asemiconductor integrated circuit device (IC) are mounted on a glassboard of the TFT board.

Driving power, display data, and control signals are supplied to thedrain drivers through a flexible printed wiring board 1, and drivingpower and control signals are supplied to the gate drivers through aflexible printed wiring board 2.

These flexible printed wiring boards 1, 2 are connected to a drivingcircuit board 3 provided at a rear side of the backlight unit.

The backlight unit of the liquid crystal display module of thisembodiment is constructed such that a cold-cathode fluorescent lamp 16,a wedge-shaped light guide body (a side shape of which is trapezoid) 9,diffusion sheets 6, 8, lens sheets 7, and a reflection sheet 10 arefitted in the order shown in FIG. 1 in a mold 14 having a side wall andformed into a frame shape.

Incidentally, in FIG. 1, reference numeral 11 designates a rubber bush;12, a connector; and 18, 19, cables.

<Structure of the Backlight Unit of the Liquid Crystal Display ModuleShown in FIG. 1>

FIG. 2 is a sectional view showing a main portion sectional structure ofthe backlight unit of the liquid crystal display module shown in FIG. 1.

Incidentally, FIG. 2 shows the sectional structure obtained by cuttingalong a plane orthogonal to the cold-cathode fluorescent lamp 16.

As shown in FIG. 2, the cold-cathode fluorescent lamp 16 is arranged inthe vicinity of a side of the light guide body 9, along the side of thelight guide body 9, and in parallel with the side of the light guidebody 9.

The light guide body 9 guides light radiated from the cold-cathodefluorescent lamp 16 to a portion remote from the cold-cathodefluorescent lamp 16, and uniformly irradiates the whole liquid crystaldisplay panel with the light.

Here, the light guide body 9 is formed into such a wedge shape that itssurface facing the cold-cathode fluorescent lamp 16 is formed to be wideand its section becomes small as it goes away from the cold-cathodefluorescent lamp 16.

The diffusion sheets 6, 8 and the two lens sheets 7 are arranged on thelight guide body.

The reflection sheet 10 which has a portion of an almost C-shapedsectional shape at the cold-cathode fluorescent lamp and a white orsilver inner surface, covers the cold-cathode fluorescent lamp 16 overalmost the whole length, and is arranged to extend to the lower side ofthe light guide body 9.

By this, light radiated in a direction different from the light guidebody 9 can be concentrated on the light guide body 9 without waste.

<Fitting Method I of the Liquid Crystal Display Module Shown in FIG. 1to a Notebook-Size Personal Computer>

FIG. 3 is a main portion sectional view showing a state where the liquidcrystal display module shown in FIG. 1 is fitted to a notebook-sizepersonal computer by a conventional fitting method 1. Incidentally, FIG.3 shows a sectional structure obtained by cutting in the same directionas an extension direction of the cold-cathode fluorescent lamp 16.

As shown in FIG. 3, the liquid crystal display module shown in FIG. 1includes inserts 13 having internal threads formed therein at fourplaces (only two places are shown in FIG. 3) of sides in the mold 14.

Then, by screwing up fitting screws 120 having external threads formedthereon to the respective inserts 13 through holes formed in an exteriorcase (for example, a plastic case) 100 of a display portion of thenotebook-size personal computer, a metal side beam 110, and the frame 4,the liquid crystal display module is fitted to the notebook-sizepersonal computer.

Besides, as shown in FIG. 3, the liquid crystal display module shown inFIG. 1 is constructed such that the liquid crystal display panel 5 onwhich the plurality of drain drivers and gate drivers are mounted, ishoused between the frame 4 having a display window and the backlightunit.

The region of the display window of the frame 4 constitutes a displayregion of the liquid crystal display module (LCM), and a region otherthan this display region, that is, a region of the periphery of thedisplay window of the frame 4 is called a normal picture frame.

Incidentally, in FIG. 3, SUB 1 designates a TFT board; SUB 2, a colorfilter board; IC2, a gate driver; and POL1, POL2, polarizing plates.

As shown in FIG. 3, in the case where the liquid crystal display moduleis fitted to the notebook-size personal computer by using the insert 13,force in the rotation direction is applied to the insert 13, andfurther, if force in the horizontal direction is applied to thenotebook-size personal computer, force in the direction of drawing outthe insert 13 is applied.

In order to prevent these, it is necessary to improve adhesion to resinwhich makes the mold 14 and to increase friction by applying knurling toan exterior of the insert 13, and therefore, it becomes necessary toincrease the thickness of the mold 14 to a certain degree at theperiphery of the insert 13.

However, when the thickness (corresponding to the height of the sidewall of the mold 14 in FIG. 3) of the mold itself becomes further thin,for example, S mm or less, by the reduction in thickness of the liquidcrystal display module, it becomes impossible to secure the sufficientthickness of the mold 14 around the insert 13. For example, in the casewhere the position of the fitting hole of the insert 13 is made thecenter of the mold 14 in the thickness direction, since the frame 4exits, there is a possibility that the thickness of the mold 14 at theupper side of the insert 13 can not be made sufficient.

The liquid crystal display device of the embodiment 1 of the presentinvention resolves such situations as mentioned previously by featuresthereof which will be described as follows.

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 1of the Present Invention>

FIG. 4 is a view for explaining a fitting portion of an insert 13 of aliquid crystal display module of the present embodiment.

Incidentally, the present embodiment will be described with reference toFIGS. 1 to 3 and on the basis of the aforementioned liquid crystaldisplay module.

FIG. 4 is a close-up perspective view showing respective portions of theframe 4 and the mold 14 relating to a mounting structure for fitting theliquid crystal display module as shown in FIG. 3 to the exterior case bythe fitting screw 120, together with the insert 13 fitted in the mold14, and illustration of portions other than those and members (exteriorcase 100, fitting screw 120, etc.) is omitted.

As shown in FIG. 4, the present embodiment is characterized in that anopening (slot) 4 a is provided at an upper portion of a region where afitting hole of the insert 13 is provided, and a protruded portion 14 aprotruding to the opening 4 a of the frame 4 is provided on the mold 14.

On this account, even if the thickness of the mold itself is made, forexample, 5.0 mm or less, by the reduction in the thickness of the liquidcrystal display module, the thickness of the mold 14 around the insert13 can be sufficiently increased, and the present embodiment is stillable to prevent the inserts 13 from rotating in the mold 14 or beingdrawn off therefrom.

Incidentally, in the present embodiment, it is necessary that theopening 4 a of the frame 4 has a sufficient size so that the protrudedportion 14 a of the mold 14 goes therein.

Besides, it is desirable that the height of the protruded portion 14 ais almost equal to the thickness of the frame 4, and the width of theprotruded portion 14 a is at least the outer diameter of the insert13+about 1 mm. Further, the protruded portion 14 a may be used as aprotruded portion for locating of the mold with respect to the frame.

[Embodiment 2]

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 2of the Present Invention>

FIGS. 5A to 5C are views for explaining a fitting portion of an insert13 of a liquid crystal display module of embodiment 2 of the presentembodiment, FIG. 5A is a front view, FIG. 5B is a main portion sectionalview showing a sectional structure along line A–A′ shown in FIG. 5A, andFIG. 5C is an upper plan view showing a shape of a mold 14.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown hi FIG. 1, in FIGS. 5A to 5C, only portions relating to afitting screw 120 are shown similarly to FIG. 4, and the other structureis omitted.

As shown in FIGS. 5A and 5B, in the present embodiment, an opening 4 bis provided at a side wall of a frame 4 made to face a side wall of amold 14 in which the insert 13 is provided.

In the present embodiment, although the opening 4 b is formed as a notch(inverted U-shape without a lower side thereof) which is made tocorrespond to the thin liquid crystal display module, it may be replacedby a rectangular or circular hole in accordance with the shape of theliquid crystal display module.

A protruded portion 14 b is provided at the side wall of the mold 14 inwhich the insert 13 is provided, and this protruded portion 14 b isfitted in the opening 4 b of the frame 4.

Then, in the present embodiment, the fitting screw 120 is screwed up tothe insert 13 through holes formed in an exterior case 100 of a displayportion of a notebook-size personal computer and a metal side beam 110,and the liquid crystal display module is fitted to the notebook-sizepersonal computer.

Accordingly, in the present embodiment, the picture frame width of theliquid crystal display module can be reduced by the thickness of theframe 4.

[Embodiment 3]

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 3of the Present Invention>

FIGS. 6A and 6B are views for explaining a fitting portion of an insert13 of a liquid crystal display module of the present embodiment, FIG. 6Ais a front view, and FIG. 6B is a main portion sectional view showing asectional structure along line A–A′ shown in FIG. 6A.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIGS. 6A and 6B, only portions relating to afitting screw 120 are shown similarly to FIG. 4, and the other structureis omitted.

As shown in FIG. 6A, the present embodiment is characterized in that thesectional shape of the insert 13 is made elliptical.

On this account, even if the thickness of a mold itself is made, forexample, 5.0 mm or less, by the reduction in thickness of the liquidcrystal display module, the present embodiment is still able to preventthe inserts 13 from rotating in the mold 14 or being drawn outtherefrom.

Incidentally, in the present embodiment, even if the sectional shape ofthe insert 13 is made rectangular instead of making the sectional shapeof the insert elliptical, the same effect can be obtained.

[Embodiment 4]

<Fitting Method 2 of the Liquid Crystal Display Module Shown in FIG. 1to a Notebook-Size Personal Computer>

FIG. 7 is a view for explaining a method of fitting the liquid crystaldisplay module shown in FIG. 1 to a notebook-size personal computer by aconventional fitting method 2.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIG. 7, only portions relating to the fittingscrew 120 are shown similarly to FIG. 4, and the other structure isomitted.

The present embodiment shown in FIG. 7 is characterized in suchstructure that instead of providing the insert 13 in the mold 14, acompromise plate nut 40 is interposed between the frame 4 and the mold14, and a fitting screw (120 of FIG. 3) is screwed to this compromiseplate nut 40 to mount the liquid crystal display module to an exteriorcase (100 of FIG. 3).

By this structural feature, the present embodiment is different fromthose shown in FIGS. 4 to 6.

In the method shown in FIG. 7, the compromise plate nut 40 shown in thedrawing is fitted in a notch 141 of the mold 14, and this compromiseplate nut 40 is covered with the frame 4 to prevent it from beingdropped off. The notch 141 can also be provided by forming a concaveportion or a groove in the outside side wall of the mold 14.

By this, the rotation of the compromise plate nut 40 in the up and downand right and left directions is restricted by engagement with the notch141 of the mold 14, and the movement in the pushing direction into theinside of the liquid crystal display module is restricted by the wall ofthe mold 14.

The frame 4 is fixed to the mold 14 in such a manner that its insideside wall is made to face the outside side wall of the mold 14, andafter the frame is fitted to the exterior of the mold 14 while thepositions of the opening 4 b and the notch 141 are made coincident witheach other, two screws 121 are screwed up to tapped holes 14 d of themold 14 through openings 4 d of the frame 4.

By this, the movement of the compromise plate nut 40 dropping off fromthe notch 141 can be prevented by the frame 4.

A fitting screw (120 of FIG. 3) is screwed up to a tapped hole 120 a ofthe compromise plate nut 40 through the hole (opening) 4 b formed in anexterior case (100 of FIG. 3) of the display portion of thenotebook-size personal computer, a metal side beam (110 of FIG. 3), andthe frame 4, so that the liquid crystal display module is fitted to thenotebook-size personal computer.

Incidentally, when the fitting screw (120 of FIG. 3) is screwed in thetapped hole 120 a, its portion protruding from the tapped hole 120 a ishoused in an opening 14 c provided in the notch 141 of the mold 14.

As set forth above, in order to fix the liquid crystal display module tothe exterior case (100 of FIG. 3) of the display portion of thenotebook-size personal computer, four or more places are normallyscrewed up.

Since the compromise plate nut 40 is apt to be dropped off from the mold14 if the frame 4 does not exist, it is difficult to fit the four ormore compromise plate nuts 40 to the notches 141 of the mold 14 and tocover them with the frame 4 at the same time.

Thus, conventionally, after the mold 14 is covered with the frame 4, thecompromise plate nut 40 is inserted from the back of the module.

However, in the conventional liquid crystal display module, when thecompromise plate nut 40 is inserted from the back of the module afterthe mold 14 is covered with the frame 4, in order to facilitate theinsertion of the compromise plate nut 40 into a gap between the mold 14and the frame 4, it is necessary that the mold 14 is slanted or theheight of the notch 141 provided in the mold 14 is lowered.

Like this, in the case where the liquid crystal display module shown inFIG. 1 is fitted to the notebook-size personal computer by theconventional fitting method 2, there has been a problem that it isdifficult to balance an insertion property of the compromise plate nut40 with falling out.

The liquid crystal display device of the embodiment 4 of the presentinvention resolves such situations as mentioned previously by featuresthereof which will be described as follows.

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 4of the Present Invention>

FIG. 8 is a view for explaining a fitting method of a plate nut of aliquid crystal display module of the present embodiment.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIG. 8, only portions relating to fixing (seeFIG. 3) of a liquid crystal display device and an exterior case of apersonal computer or the like by a fitting screw 120 are shown similarlyto FIG. 7, and illustration of the other structure is omitted.

In the present embodiment, before a mold 14 is covered with a frame 4, aplate nut 30 is fixed to a predetermined position of the mold 14 by anadhesive 41.

In an example of FIG. 8, the side wall of the mold 14 is partially madethin to form a concave portion (corresponding to the aforementionednotch) 141. The adhesive 41 is coated on the bottom of the concaveportion 141.

The plate nut 30 has a tapped hole 120 a to which a fitting screw (120of FIG. 3) is screwed, similarly to the compromise plate nut 40.

Incidentally, in the present embodiment, the plate nut 30 may be thecompromise plate nut 40 shown in FIG. 7, or may be a general rectangularplate nut.

Further, a roughness for positioning may be provided to the plate nut 30and the mold 14, or a pressure sensitive adhesive double coated tape maybe used instead of the adhesive 41.

Like this, since the plate nut 30 is previously fixed to the mold 14 bythe adhesive 41 (or, pressure sensitive adhesive double coated tape,double sided adhesive tape), the present embodiment facilitates fittingof the plate nut 30 to the mold 14, and is able to prevent the plate nut30 from falling out in an assembling process of the liquid crystaldisplay module, and to improve work efficiency.

[Embodiment 5]

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 5of the Present Invention>

FIG. 9 is a view for explaining a fitting method of a plate nut of aliquid crystal display module of the present embodiment.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIG. 9, only portions relating to fixing (seeFIG. 3) of a liquid crystal display device and an exterior case of apersonal computer or the like by a fitting screw 120 are shown similarlyto FIG. 7, and illustration of the other structure is omitted.

In the present embodiment, before a mold 14 is covered with a frame 4, acompromise plate nut 31 is fixed to a predetermined position of the mold14 by a screw 122.

Incidentally, in the present embodiment, a roughness for positioning maybe provided to the compromise plate nut 31 and the mold 14.

In a cut hole 31 a provided in the compromise plate nut 31 for fixing tothe mold 14, it is desirable that a concave portion in which a head ofthe screw 122 is inserted, is provided at the periphery of a tapped holeat a frame side, so that the head of the screw 122 does not protrudefrom the compromise plate nut 31.

The screw 122 can be made a flush bolt, and also in this case, it ispossible to prevent the screw 122 from protruding from the compromiseplate nut 31.

It is also possible to tighten the frame 4, the mold 14, and thecompromise plate nut 31 together by the screw 122, and in that case, inthe frame 4, at a screwing portion, it is necessary to provide a concaveportion in which the head of the screw 122 is inserted. Further, it isdesirable to shave the plate thickness of the compromise plate nut 31 inaccordance with the concave portion of the frame 4.

Like this, since the compromise plate nut 31 is previously fixed to themold 14 by the screw 122, the present embodiment facilitates fitting ofthe compromise plate nut 31 to the mold, and is able to prevent thecompromise plate nut 31 from being dropped off in an assembling processof the liquid crystal display module and to improve work efficiency.

[Embodiment 6]

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 6of the Present Invention>

FIG. 10 is a view for explaining a fitting method of a compromise ridgednut of a liquid crystal display module of the present embodiment.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIG. 10, only portions relating to fixing(see FIG. 3) of a liquid crystal display device and an exterior case ofa personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

In the present embodiment, a compromise ridged nut 32 has a cut hole 32a in which a screw 122 for fixing a frame 4 to a mold 14 is inserted,and a tapped hole 120 a in which the fitting screw 120 (for example, seeFIG. 3) for fitting the liquid crystal display device to the housing ofthe notebook-size personal computer is inserted, and has a step providedbetween a portion where the tapped hole 120 a is provided and itsperiphery, and the nut is fixed to the mold 14 by the screw 122.

As shown in FIG. 10, when viewed from the outside of the liquid crystaldisplay device, the surface where the tapped hole 120 a of thecompromise plate nut 32 is provided, rises from the surface where thecut hole 32 a is provided. In other words, the surface of the compromiseridged nut 32 at the side of the side wall of the frame 4 includes theportion (for example, called a central portion) where the tapped hole120 a is provided and portions (for example, called peripheral portions)respectively extending from both the sides facing each other, and thesurface of the central portion protrudes toward the side of the sidewall of the frame 4 from the surfaces of the peripheral portions.Accordingly, the illustrated shape of the compromise ridged nut 32 ischaracterized by having a step in the thickness direction of one of theside wall of the mold 14 to which this nut is provided and the side wallof the frame 4.

As is apparent from FIG. 10, in the present embodiment, the tapped hole120 a in which the fitting screw 120 for fitting to the notebook-sizepersonal computer is inserted, is not covered with the frame 4.

Similarly to the examples of FIGS. 8 and 9, also in the presentembodiment, a concave portion 141 is formed in the side wall of the mold14 in its thickness direction, and further, in the present embodiment,the side wall of the frame 4 is made depressed toward the side of themold side wall in connection with the concave portion 141.

An opening 4 d used for fitting the compromise ridged nut 32 to the mold14 by the screw 122 is formed in the concave portion of the side wall ofthe frame, and the concave portion of the side wall of the frame 4functions as a washer between the head of the screw 122 and thecompromise ridged nut 32 at the periphery of the opening 4 d.

An opening 4 b corresponding to the step of the compromise ridged nut 32is also formed in the concave portion of the side wall of the frame 4.

The opening 4 b shown in the present embodiment is formed, similarly tothat explained with reference to FIGS. 5A, 5B, 6A and 6B, as a so-callednotch in which a part of the side wall of the frame surrounding theopening 4 b is removed.

This opening 4 b suppresses the movement of the portion of thecompromise ridged nut 32 protruding toward the side opposite to the mold14 at its right and left end portions.

Thus, even if an error between the length of the compromise ridged nut32 and the length of the concave portion 141 of the mold 14 in whichthis is inserted becomes large, the deviation of the compromise ridgednut 32 in the length direction (horizontal direction when viewed fromthe liquid crystal display module) resulting from this can be suppressedby the opening 4 b.

Accordingly, in the present embodiment, in the ease where the liquidcrystal display module is fitted to the notebook-size personal computer,the fitting screw 120 is screwed up to the compromise ridged nut 32through the hole formed in the exterior case (100 of FIG. 3) of thedisplay portion of the notebook-size personal computer and the metalside beam (110 of FIG. 3), so that the liquid crystal display module isfitted to the notebook-size personal computer.

Incidentally, in the present embodiment, a roughness for positioning maybe provided to the compromise ridged nut 32 and the mold 14.

Besides, in the cut hole 32 a provided in the compromise ridged nut 32for fixing to the mold 14, it is desirable that a concave portion inwhich a head of the screw 122 is inserted, is provided at the peripheryof a tapped hole at a frame side, so that the head of the screw 122 doesnot protrude from the compromise ridged nut 32.

Besides, the screw 122 can be made a flush bolt, and also in this case,it is possible to prevent the screw 122 from protruding from thecompromise ridged nut 32.

Like this, since the compromise ridged nut 32 is fixed to the mold 14 bythe screw 122, the present embodiment facilitates fitting of thecompromise ridged nut 32 to the mold 14, and is able to prevent thecompromise ridged nut 32 from being dropped off in an assembling processof the liquid crystal display module and to improve work efficiency.

[Embodiment 7]

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 7of the Present Invention>

FIG. 11 is a view for explaining a fitting method of a compromise ridgednut of a liquid crystal display module of the present embodiment.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIG. 11, only portions relating to fixing(see FIG. 3) of a liquid crystal display device and an exterior case ofa personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

In the present embodiment, a compromise ridged nut 33 provided with aT-shaped protruded portion 33 a is used, and a slit (groove) 142 inwhich the T-shaped protruded portion 33 a of the compromise ridged nut33 is inserted, is provided in a mold 14, and the compromise ridged nut33 is inserted in the slit 142 formed in the mold 14 from above.

According to the present embodiment, the slit 142 formed in the mold 14restrains the movement of the compromise ridged nut 33 in the crossdirection (thickness direction of the mold side wall) and in thehorizontal direction (extending direction of the slit 142), and itsrotation.

Besides, by covering the opening of the slit 142 provided on the uppersurface of the mold 14 with the frame 4, the movement of the compromiseridged nut 32 in the vertical direction (thickness direction of theliquid crystal display module) is restrained.

A recess 142 a for providing a space which receives an end portion ofthe fitting screw (120 of FIG. 3) projecting through a tapped hole 120 ato the mold side, is formed at the central portion of the slit 142.

As is apparent from FIG. 11, in the present embodiment, the tapped hole120 a to which the fitting screw 120 for fitting to the notebook-sizepersonal computer is screwed, is not covered with the frame 4.

Accordingly, in the present embodiment, in the case where the liquidcrystal display module is fitted to the notebook-size personal computer,the fitting screw 120 is screwed up to the compromise ridged nut 33through the hole formed in the exterior case (100 of FIG. 3) of thedisplay portion of the notebook-size personal computer and the metalside beam (110 of FIG. 3), so that the liquid crystal display module isfitted to the notebook-size personal computer.

Incidentally, in the present embodiment, the exterior of the wallportion of the slit 142 in which the T-shaped protruded portion 33 a isinserted may be covered with the frame 4 or may not be coveredtherewith.

As shown in FIG. 12, when it is not covered with the frame 4, althoughthe picture frame width of the liquid crystal display module can bereduced by the thickness of the frame 4, the strength weakens to thecontrary since a portion without a vertical wall of the frame 4 becomeslarge.

Like this, since the compromise ridged nut 33 is held by the slit 142provided in the mold 14, the present embodiment facilitates fitting ofthe compromise ridged nut 33 to the mold 14, and is able to prevent thecompromise ridged nut from being dropped off in an assembling process ofthe liquid crystal display module and to improve work efficiency.

[Embodiment 8]

<Feature of a TET System Liquid Crystal Display Module of Embodiment 8of the Present Invention>

FIG. 13 is a view for explaining a fitting method of a compromise ridgednut of a liquid crystal display module of the embodiment 8 of thepresent invention.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIG. 13, only portions relating to fixing(see FIG. 3) of a liquid crystal display device and an exterior case ofa personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

Also in the present embodiment, a compromise ridged nut 34 provided witha T-shaped protruded portion 34 a is used, a slit (groove) 143 in whichthe T-shaped protruded portion 34 a of the compromise ridged nut 34 isinserted, is provided in a mold 14, and the compromise ridged nut 34 isinserted in the slit 143 formed in the mold 14 from above.

However, the present embodiment is different from the liquid crystaldisplay module of the embodiment 7 in that the lower surface of theprotruded portion 34 a of the compromise ridged nut 34 is chamfered andeaves 143 a for preventing the compromise ridged nut 34 from being drawnout upwards from the mold 14 are provided at the slit 143 provided inthe mold 14.

Incidentally, a side of the cave 143 a is chamfered so that thecompromise ridged nut 34 can easily enter.

The present embodiment also facilitates fitting of the compromise ridgednut 34 to the mold 14, and is able to prevent the compromise ridged nut34 from being dropped off in an assembling process of the liquid crystaldisplay module and to improve work efficiency.

[Embodiment 9]

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 9of the Present Invention>

FIG. 14 is a view for explaining a fitting method of a compromise ridgednut of a liquid crystal display module of the present embodiment.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIG. 14, only portions relating to fixing(see FIG. 3) of a liquid crystal display device and an exterior ease ofa personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

The present embodiment is different from the liquid crystal displaymodule of the embodiment 8 in that a compromise ridged nut 35 is rotatedto be inserted in a slit (groove) 144 formed in a mold 14.

In the present embodiment, chamfering of a protruded portion 35 a of thecompromise ridged nut 35 is provided to a surface in a rotationadvancing direction of the fitting screw 120 for fitting the liquidcrystal display module to the notebook-size personal computer.

The present embodiment also facilitates fitting of the compromise ridgednut 35 to the mold 14, and is able to prevent the compromise ridged nut35 from being dropped off in an assembling process of the liquid crystaldisplay module and to improve work efficiency.

[Embodiment 10]

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 10of the Present Invention>

FIG. 15 is a view for explaining a fitting method of a compromise ridgednut of a liquid crystal display module of the embodiment 10 of thepresent invention.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIG. 15, only portions relating to fixing(see FIG. 3) of a liquid crystal display device and an exterior case ofa personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

In the present embodiment, a compromise ridged nut 36 provided with aT-shaped protruded portion 36 a is used, and after a mold 14 is coveredwith a frame 4, the compromise ridged nut 36 is inserted in a concaveportion 145 formed in the mold 14, and is fixed by bending a pawl 25 ofthe frame 4.

The present embodiment is also able to prevent the compromise ridged nut36 from being dropped off in an assembling process of the liquid crystaldisplay module and to improve work efficiency.

Further, in the present embodiment, contrary to the aforementionedrespective embodiments, since it is not necessary that the compromiseridged nut 36 is fixed to the mold 14 by the screw 122 or is inserted inthe slits 142, 143, 144 of the mold 14, fitting of the compromise ridgednut 36 to the mold 14 becomes easy as compared with the aforementionedrespective embodiments, and work efficiency can be improved.

[Embodiment 11]

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 11of the Present Invention>

FIGS. 16A to 16C are views for explaining a fitting method of a C-shapednut 40 to a liquid crystal display module of the present embodiment,FIG. 16A is a front view of the liquid crystal display module, FIG. 16Bis a main portion sectional view showing a sectional structure alongline A–A′ shown in FIG. 16A, and FIG. 16C is a perspective view showinga shape of the metal plate 40.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIGS. 16A to 16C, only portions relating to afitting screw 120 are shown similarly to FIG. 4, and the other structureis omitted.

In the present embodiment, the C-shaped (channel type) nut 40 is used,aside wall 40 a of the C-shaped nut 40 in which a tapped hole 120 a isprovided, is arranged at a portion of a side wall of a mold 14 where ahole 146 in which the fitting screw 120 is inserted is formed, the otherside wall 40 b is inserted in a slit (groove) 147 formed in the mold 14,and the C-shaped nut 40 is fixed by the elasticity of the C-shaped nutitself.

The present embodiment is also able to prevent the C shaped nut 40 frombeing dropped off in an assembling process of the liquid crystal displaymodule and to improve work efficiency.

[Embodiment 12]

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 12of the Present Invention>

FIGS. 17A and 17B are views for explaining a frame 4 of a liquid crystaldisplay module of the present embodiment, FIG. 17A is a front view ofthe liquid crystal display module (frame 4), and FIG. 17B is a mainportion sectional view showing a sectional structure along line A–A′shown in FIG. 17A.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIGS. 17A and 17B, only portions relating toa fitting screw 120 are shown, and the other structure is omitted.

In the present embodiment, a tapped hole 120 a is provided in the frameitself, and a hole 146 in which the fitting screw 120 is inserted isformed in a side wall of a mold 14, so that the fitting screw 120 isscrewed to this tapped hole 120 a.

Accordingly, in the present embodiment, since the plate nut or thecompromise ridged nut is not necessary contrary to the aforementionedrespective embodiments, the number of parts can be lessened, and a screwmechanism of the fitting screw 120 can be simplified.

[Embodiment 13]

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 13of the Present Invention>

FIGS. 18A and 18B are views for explaining a fitting method of a leafspring nut 50 of a liquid crystal display module of the embodiment 13 ofthe present invention, FIG. 18A is a front view of the liquid crystaldisplay module, and FIG. 18B is a main portion sectional view showing asectional structure along line A–A′ shown in FIG. 18A.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is also the same as the liquid crystal displaymodule shown in FIG. 1, in FIGS. 18A and 18B, only portions relating toa fitting screw 120 are shown, and the other structure is omitted.

In the present embodiment, a hole 4 c through which the fitting screw120 passes is provided in a frame 4, the leaf spring nut 50 is fitted tothe back (side wall of a mold 14) side of the hole 4 c by welding or thelike, and the fitting screw 120 is screwed to the leaf spring nut 50.

In the embodiment, although the leaf spring nut 50 is provided at upperand lower places of the hole 4 c of the frame 4, this may be provided atright and left places of the hole 4 c, or may be provided so as tosurround the hole 4 c.

The present embodiment facilitates fitting of the leaf spring nut 50 tothe frame 4, and is able to prevent the leaf spring nut 50 from beingdropped off in an assembling process of the liquid crystal displaymodule and to improve work efficiency.

[Embodiment 14]

In the liquid crystal display module shown in FIG. 1, although thedriving circuit board 3 is arranged at the rear side (rear side of themold 14) of the backlight unit, in order to further reduce the thicknessof the liquid crystal display module, as shown in FIG. 19, it iseffective to arrange the driving circuit board 3 between the liquidcrystal display panel 5 and the side wall of the mold 14. In the casewhere the liquid crystal display module is in an active matrix drivingsystem, a driving circuit (semiconductor integrated circuit device) forsupplying a scanning signal or a video signal to a liquid crystaldisplay element is mounted on the driving circuit board, or a wiringline for supplying a signal or driving power to the driving circuit isformed thereon. In the ease where the liquid crystal display module isin a passive matrix driving system, a driving circuit for supplying acommon signal or a segment signal to a liquid crystal display element ismounted on the driving circuit board or a wiring line for supplying asignal or driving power to the driving circuit is formed thereon.

FIG. 19 is a schematic sectional view showing the sectional structure ofthe liquid crystal display module which is made thin, and FIG. 19 showsa sectional structure obtained by cutting in the same direction as theextending direction of the cold-cathode fluorescent lamp 16.

Further, FIG. 19 shows diffusion sheets 6, 8 and two lens sheets 7together as an optical element 15.

However, in the liquid crystal display module shown in FIG. 19, sincethe driving circuit board 3 is arranged on the side wall of the mold 14,for example, as in the embodiment 12, in the case where the fittingscrew 120 is screwed to the tapped hole 120 a provided in the frame 4,there is a problem that a portion of the fitting screw 120 protrudingfrom the tapped hole 120 a to the mole side interferes with the drivingcircuit board 3.

In order to solve this problem, although there is a method in which thepicture frame region of the liquid crystal display module is widened sothat the fitting screw 120 does not interfere with the driving circuitboard 3, in this case, both the reduction in picture frame width and thereduction in thickness can not be achieved.

The liquid crystal display device of the embodiment 14 of the presentinvention resolves such situations as mentioned previously by featuresthereof which will be described as follows.

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 14of the Present Invention>

FIG. 20 is a plan view conceptually showing a plane shape of a drivingcircuit board of a liquid crystal display module of embodiment 14 of thepresent invention in a thickness direction of the liquid crystal displaymodule.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is the same as the liquid crystal displaymodule shown in FIG. 19, in FIG. 20, only portions relating to a fittingscrew 120 are shown, and illustration of the other structure is omitted.

As is apparent from FIG. 20, in the present embodiment, a notch (concaveportion) 3 a is formed in a driving circuit board 3 from an end portionfacing a frame 4 to prevent interference between a tip of the fittingscrew 120 protruding from a tapped hole 120 a and the driving circuitboard 3.

By this, the present embodiment is able to further reduce the thicknessof the liquid crystal display module.

Incidentally, in FIG. 20, although the description has been given of theease where the fitting screw 120 is screwed to the tapped hole 4 bprovided in the frame 4, the present invention can also be applied tothe case where the fitting screw 120 is screwed to the insert 13embedded in the mold 14, or the nut such as the plate nut fixed to themold 14 or the ridged nut.

Supposing the fitting screw 120 and the driving circuit board 3 arearranged at different positions (heights) in the thickness direction ofthe liquid crystal display module, and the fitting screw 20 is projectedto the concave portion 3 a of the driving circuit board 3 in thisthickness direction as shown in FIG. 20, as in the embodiment 1, theinterference between the upper protruded portion (14 a of FIG. 4) of theportion where the insert 13 of the mold 14 is provided and the drivingcircuit board 3 can be avoided by the formation of the concave portion 3a.

When the example like this is supposed, even in the embodiments 4 to 10in which the upper surface is suppressed by using the plate nut or thelike, the interference between the upper surface of this plate nut andthe driving circuit board 3 can also be avoided by the formation of theconcave portion 3 a.

[Embodiment 15]

<Feature of a TFT System Liquid Crystal Display Module of Embodiment 15of the Present Invention>

FIGS. 21A and 21B are views for explaining a shape of a driving circuitboard of a liquid crystal display module of embodiment 15 of the presentinvention, FIG. 21A is a plan view showing the relation among a fittingscrew 120, a frame 4, and a driving circuit board 3, and FIG. 21B is amain portion sectional view showing the relation among the fitting screw120, the frame 4, and the driving circuit board 3.

Incidentally, since the structure of the liquid crystal display moduleof the present embodiment is the same as the liquid crystal displaymodule shown in FIG. 19, in FIGS. 21A and 21B, only portions relating tothe fitting screw 120 are shown, and the other structure is omitted.

As is apparent from FIG. 21A, in the present embodiment, the drivingcircuit board 3 is divided in two, the fitting screw 120 is entered adivided portion, the two divided driving circuit boards are connected bya flexible wiring board 3 b, and by this, the interference between thefitting screw 120 and the driving circuit board 3 is prevented.

Accordingly, the present embodiment is also able to further reduce thethickness of the liquid crystal display module.

Incidentally, in FIGS. 21A and 21B, although the description has beengiven of the case where the fitting screw 120 is screwed to the tappedhole 4 b provided in the frame 4, the present invention can be appliedalso to the ease where the fitting screw 120 is screwed to the insert 13embedded in the mold 14, or the nut such as the plate nut fixed to themold 14 or the ridged nut.

Incidentally, in the aforementioned respective embodiments, although thedescription has been mainly given of the embodiments in which thepresent invention is applied to the TFT system liquid crystal displaymodule, it is needless to say that the present invention can also beapplied to an STN system liquid crystal display module.

In the foregoing, although the present invention made by the presentinventor has been specifically described on the basis of theembodiments, the present invention is not limited to the embodiments,but can be naturally variously modified in the scope not departing fromthe gist.

Typical effects obtained by the present invention disclosed in thepresent application are briefly explained as follows:

(1) According to the liquid crystal display device of the presentinvention, the screw member to which the fitting screw for fixing theliquid crystal display device to the exterior case is screwed, can besimply and certainly fitted.

(2) According to the liquid crystal display device of the presentinvention, the screw mechanism of the fitting screw for fixing theliquid crystal display device to the exterior case can be simplified.

(3) According to the liquid crystal display device of the presentinvention, the thickness of the liquid crystal display device can bereduced.

(4) According to the liquid crystal display device of the presentinvention, the picture frame width of the liquid crystal display devicecan be reduced.

While we have shown and described several embodiments in accordance withthe present invention, it is understood that the same is not limitedthereto but is susceptible of numerous changes and modifications asknown to those skilled in the art, and we therefore do not wish to belimited to the details shown and described herein but intend to coverall such changes and modifications as are encompassed by the scope ofthe appended claims.

1. A liquid crystal display device comprising: a liquid crystal displayelement; a frame member having a frame-shaped part which is arranged ata displaying surface side of the liquid crystal display element andhaving a display window exposing a displaying surface of the liquidcrystal display element, the frame member having a side wall whichextends from the frame-shaped part along a thickness direction of theliquid crystal display element; a light source which is arrangedopposite to another surface of the liquid crystal display elementopposite to the displaying surface thereof, the light source irradiatingthe another surface of the liquid crystal display element withillumination light; and a housing member having a main surface oppositeto the frame-shaped part of the frame member and a side wall formed at aperiphery of the main surface thereof, the housing member housing thelight source therein; wherein the frame member is fixed to the housingmember so as to cover the main surface of the housing member with theframe-shaped part of the frame member while an outer surface of the sidewall of the housing member is covered with an inner surface of the sidewall of the frame member; wherein a nut member having a tapped hole isfixed to the housing member by a first screw which is screwed to thehousing member, the tapped hole is positioned in the outer surface ofthe side wall of the housing member, and wherein a second screw isscrewed into the tapped hole in a direction transverse to the thicknessdirection of the liquid crystal display element and fixes the liquidcrystal display device to an exterior case, the first screw beingcovered with the frame member.
 2. A liquid crystal display deviceaccording to claim 1, wherein the frame member has an opening formed ata part of the side wall thereof, and the second screw is screwed to thetapped hole of the nut member through the opening.
 3. A liquid crystaldisplay device according to claim 1, wherein the housing member has anopening formed at a part of the side wall thereof which is opposite tothe tapped hole of the nut member.
 4. A liquid crystal display deviceaccording to claim 1, wherein the frame member is made of metal and thehousing member is molded of resin material.
 5. A liquid crystal displaydevice according to claim 1, wherein the housing member has anothertapped hole formed at a part of the side wall thereof, and the firstscrew is screwed to the another tapped hole.